Identifying the Geometric Site Dependence of Spinel Oxides for the Electrooxidation of 5‐Hydroxymethylfurfural. (26th August 2020)

• Record Type: Journal Article
• Authors: Lu, Yuxuan; Dong, Chung‐Li; Huang, Yu‐Cheng; Zou, Yuqin; Liu, Zhijuan; Liu, Yanbo; Li, Yingying; He, Nihan; Shi, Jianqiao; Wang, Shuangyin
• Is Part Of: Angewandte Chemie. Volume 132:Number 43(2020)
• Page Start: 19377
• Page End: 19383
• Publication Date: 2020-08-26
• Subjects: electrochemical biomass conversion -- geometry effects -- lattice modifications -- metal-oxygen covalency -- spinel oxides; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202007767
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Co‐based spinel oxides, which are of mixing valences with the presence of both Co 2+ and Co 3+ at different atom locations, are considered as promising catalysts for the electrochemical oxidation of 5‐hydroxymethylfurfural (HMF). Identifying the role of each atom site in the electroxidation of HMF is critical to design the advanced electrocatalysts. In this work, we found that Co 2+ Td in Co3 O4 is capable of chemical adsorption for acidic organic molecules, and Co 3+ Oh play a decisive role in HMF oxidation. Thereafter, the Cu 2+ was introduced in spinel oxides to enhance the exposure degree of Co 3+ and to boost acidic adsorption and thus to enhance the electrocatalytic activity for HMF electrooxidation significantly. Abstract : The exploration of optimal geometrical site in Co3 O4 for electrochemical HMF oxidation by the building tetrahedral (Zn 2+ ) and octahedral (Al 3+ ) blocks is described. The electrochemical results demonstrate that Co 3+ Oh are the best geometrical sites for HMF oxidation, and the chemical adsorption for acidic organic molecules is dominated by Co 2+ Td . The exposure degree of Co 3+ is improved by Cu 2+ and thus results in a record activity.